Cucumber Soup

Name: Cucumber Soup
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: European
Ingredients: 320 g cucumbers (approx. 3), cut in pieces; 90 g onions; 30 g butter; 500 g water; 1 Tbsp vegetable stock paste (see tips), to taste; 1 sprig fresh dill, leaves only; 200 g potatoes, peeled and cut in pieces (3 cm); 1 pinch fine sea salt, to taste; 1 pinch ground black pepper, to taste; 1 tsp raw sugar (optional); 100 g whipping cream